Pejanović, R., M. Tomaš, D. Glavaš-Trbić, and Z. Njegovan. “ORGANIC PRODUCTION IN THE DANUBE REGION”. Economics of Agriculture, vol. 58, no. 1 Book 1, Dec. 2011, pp. 220-7, https://ea.bg.ac.rs/index.php/EA/article/view/830.